Many work in navegation, map, drawer, about, slider

lib/sandbox.dart

@@ -13,13 +13,25 @@ class Sandbox extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-     //showDialog(context: context, child: builder(context));
+    //showDialog(context: context, child: builder(context));
     return Scaffold(
-      body: new CenteredColumn(
-        children: <Widget>[
-          new FireDistanceSlider()
-
-        ],
+      body: LayoutBuilder(
+        builder: (context, constraints) =>
+            Stack(fit: StackFit.expand, children: <Widget>[
+              // Material(color: Colors.yellowAccent),
+              Positioned(
+                top: 0.0,
+                child: Icon(Icons.star, size: 40.0),
+              ),
+              Positioned(
+                top: constraints.maxHeight - 80,
+                right: 10.0,
+                left: 10.0,
+                child: new CenteredRow(
+                  children: <Widget>[new FireDistanceSlider()],
+                ),
+              )
+            ]),
       ),
     );
   }